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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_LOG_EXPL_Sharepoint_CVE_2023_29357_Sep23_1

Detects log entries that could indicate a successful exploitation of CVE-2023-29357 on Microsoft SharePoint servers with the published Python POC

ExploitSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Florian Roth (with help from @LuemmelSec)
Date
2023-09-28
Modified
2023-10-01
Score / Quality
70 / 85

What this rule detects

Detects log entries that could indicate a successful exploitation of CVE-2023-29357 on Microsoft SharePoint servers with the published Python POC

It defines 1 patterns (0 text, 0 hex, 1 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
log-expl-sharepoint-cve-2023-29357-sep23-1.yarDetection Rule License 1.1
rule SIGNATURE_BASE_LOG_EXPL_Sharepoint_CVE_2023_29357_Sep23_1 : CVE_2023_29357
{
	meta:
		description = "Detects log entries that could indicate a successful exploitation of CVE-2023-29357 on Microsoft SharePoint servers with the published Python POC"
		author = "Florian Roth (with help from @LuemmelSec)"
		id = "9fa77216-c0d6-55e5-bbcc-adb9438ca456"
		date = "2023-09-28"
		modified = "2023-10-01"
		reference = "https://twitter.com/Gi7w0rm/status/1706764212704591953?s=20"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/expl_sharepoint_cve_2023_29357.yar#L2-L20"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "03e3a4715c8683dc8d03ad6720c1c9b40482bd0bfa3020aa1152565ec9ec929f"
		score = 70
		quality = 85
		tags = "CVE-2023-29357"

	strings:
		$xr1 = /GET [a-z\.\/_]{0,40}\/web\/(siteusers|currentuser) - (80|443) .{10,200} (python-requests\/[0-9\.]{3,8}|-) [^ ]{1,160} [^4]0[0-9] /

	condition:
		$xr1
}

Strings (1 patterns)

IdentifierTypeValueModifiers
$xr1regex/GET [a-z\.\/_]{0,40}\/web\/(siteusers|currentuser) - (80|443) .{10,200} (python-requests\/[0-9\.]{3,8}|-) [^ ]{1,160} [^4]0[0-9] /

Condition

$xr1

In plain words (Heuristic)

  • Pattern $xr1 must be present.

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References

Licence & attribution

Author: Florian Roth (with help from @LuemmelSec)

Source repository: Signature Base (Florian Roth / Nextron) @ 94a1c48d7a

Licence: Detection Rule License 1.1 (repository licence)

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: 9fa77216-c0d6-55e5-bbcc-adb9438ca456

Tags:CVE_2023_29357